lib/strdup.c

   1 /* Copyright (C) 1991, 1996-1998, 2002-2004, 2006-2007, 2009-2020 Free Software
   2    Foundation, Inc.
   3
   4    This file is part of the GNU C Library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License along
  17    with this program; if not, see <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _LIBC
  20 # include <config.h>
  21 #endif
  22
  23 /* Get specification.  */
  24 #include <string.h>
  25
  26 #include <stdlib.h>
  27
  28 #undef __strdup
  29 #ifdef _LIBC
  30 # undef strdup
  31 #endif
  32
  33 #ifndef weak_alias
  34 # define __strdup strdup
  35 #endif
  36
  37 /* Duplicate S, returning an identical malloc'd string.  */
  38 char *
  39 __strdup (const char *s)
  40 {
  41   size_t len = strlen (s) + 1;
  42   void *new = malloc (len);
  43
  44   if (new == NULL)
  45     return NULL;
  46
  47   return (char *) memcpy (new, s, len);
  48 }
  49 #ifdef libc_hidden_def
  50 libc_hidden_def (__strdup)
  51 #endif
  52 #ifdef weak_alias
  53 weak_alias (__strdup, strdup)
  54 #endif